You do need to verify that the root user (which would make Other show in the login window) is still not enabled.
The Root account folder would NOT be in the Users folder anyway, as it is a special account.
Go to your Directory Utility. Quickest method is to go to the /System/Library/CoreServices, then the Applications folder. In older OS X versions, it will just be in the CoreServices folder.
Open Directory Utility, then click the padlock to unlock that utility.
Go to the Edit menu. You SHOULD see "Enable Root User", which means that the root user is NOT enabled.
If you see "Disable Root User", then despite your opinion, the root user IS enabled, and you can click on that item "Disable Root User" to stop access through that means.
Quit Directory Utility.
I like to restart my Mac after changing the root user status, and I recommend that you do that if you had to disable root.
That will also get rid of that "Other" account on the login screen.